An inherited HERMES_HOME can defeat a test bundle's data-directory suffix.
Older Windows installers also persisted that variable in the user registry.
This gives the app fresh UI state while its backend reads existing sessions.
Add --bundle-unset NAME, encoded as null in the existing bundle environment
object. Apply each clear as an explicit empty value before module startup.
Do not restore an explicitly empty HERMES_HOME from the Windows registry.
Ordinary defaults still preserve runtime overrides.
Verified the release parser, builder handoff, compiled startup ordering,
registry opt-out, and child environment with focused regression tests.
A native Windows probe passed with an inherited home. No MSIX was rebuilt.
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